The ADO driver does not suffer from the problems the ODBC driver has with these types of columns. You can use them safely.

When you execute a CREATE TABLE statement over this driver with a TEXT column, it will be converted to MEMO, while in the ODBC driver it is converted to VARCHAR(255).

However, the caveat about LongReadLen having to be twice the max size of your largest MEMO/TEXT column +1 still applies. DBD::ADO sets LongReadLen to a large value by default, so it should be safe to just leave it unset. If you do pass a LongReadLen in your connect_info, it will be multiplied by two and 1 added, just as for the ODBC driver.